MSSQL 中 "GO" 的正确语法是什么？

Question

我正在尝试 运行 一个将登录添加到 MSSQL 的脚本，它包含两个 GO 命令，这两个命令都会产生错误：Msg 102 ... 'GO' 附近的语法不正确。以下示例代码 运行s 在名为 MyDB

的数据库上

DECLARE @currentUsername varchar(30);
DECLARE @password varchar(10);
SET @currentUsername = 'thisisatest';
SET @password = 'mypassword13';

DECLARE @addUser varchar(1000);
SET @addUser = '
    CREATE LOGIN ' + @currentUsername + '
    WITH PASSWORD = ''' + @password + ''',
    DEFAULT_DATABASE = [MyDB]
    GO
    USE MyDB
    CREATE USER ' + @currentUsername + ' FOR LOGIN ' + @currentUsername + '
    EXEC sp_addrolemember ''db_datareader'', ''' + @currentUsername + '''
    EXEC sp_addrolemember ''db_datawriter'', ''' + @currentUsername + '''
    GO
';
PRINT @addUser;
EXEC (@addUser);

Answer 1

GO 不是常规的 SQL 语句。来自 MSDN:

GO is not a Transact-SQL statement; it is a command recognized by the sqlcmd and osql utilities and SQL Server Management Studio Code editor.

尝试像这样将其分解为多个调用：

DECLARE @currentUsername varchar(30);
DECLARE @password varchar(10);
SET @currentUsername = 'thisisatest';
SET @password = 'mypassword13';

DECLARE @addUser varchar(1000);
SET @addUser = '
    CREATE LOGIN ' + @currentUsername + '
    WITH PASSWORD = ''' + @password + ''',
    DEFAULT_DATABASE = [MyDB]
';
PRINT @addUser;
EXEC (@addUser);

SET @addUser = '
    USE MyDB
    CREATE USER ' + @currentUsername + ' FOR LOGIN ' + @currentUsername + '
    EXEC sp_addrolemember ''db_datareader'', ''' + @currentUsername + '''
    EXEC sp_addrolemember ''db_datawriter'', ''' + @currentUsername + '''
';
PRINT @addUser;
EXEC (@addUser);